HD74HCT245 PDF даташит
Спецификация HD74HCT245 изготовлена «Hitachi Semiconductor» и имеет функцию, называемую «Octal Bus Transceivers (with 3-state outputs)». |
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Детали детали
Номер произв | HD74HCT245 |
Описание | Octal Bus Transceivers (with 3-state outputs) |
Производители | Hitachi Semiconductor |
логотип |
8 Pages
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HD74HCT245
Octal Bus Transceivers (with 3-state outputs)
Description
This device has an active low enable input G and a direction control input (DIR). When DIR is high, data
flows from the A inputs to the B outputs. When DIR is low, data flows from the B inputs to the A outputs.
The HD74HCT245 transfers true data from one bus to the other.
This device does not have schmitt trigger inputs.
Features
• LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility
• High Speed Operation: tpd (A to Y) = 12 ns typ (CL = 50 pF)
• High Output Current: Fanout of 15 LSTTL Loads
• Wide Operating Voltage: VCC = 4.5 to 5.5 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
Enable G
L
L
H
H : High level
L : Low level
X : Irrelevant
Direction Control DIR
L
H
X
Operation
B data to A bus
A data to B bus
Isolation
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HD74HCT245
Pin Arrangement
DIR 1
A1 2
A2 3
A3 4
A4 5
A5 6
A6 7
A7 8
A8 9
GND 10
(Top view)
Absolute Maximum Ratings
Item
Supply voltage range
Input voltage
Output voltage
DC current drain per pin
DC current drain per VCC, GND
DC input diode current
DC output diode current
Power dissipation per package
Storage temperature
Symbol
VCC
VIN
VOUT
I OUT
ICC, IGND
I IK
I OK
PT
Tstg
20 VCC
19 Enable G
18 B1
17 B2
16 B3
15 B4
14 B5
13 B6
12 B7
11 B8
Rating
–0.5 to +7.0
–0.5 to VCC + 0.5
–0.5 to VCC + 0.5
±35
±75
±20
±20
500
–65 to +150
Unit
V
V
V
mA
mA
mA
mA
mW
°C
2
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HD74HCT245
DC Characteristics
Ta = 25°C
Ta = –40 to
+85°C
Test Conditions
Item
Input voltage
Symbol Min Typ Max Min
VIH 2.0 — — 2.0
Max
—
Unit
V
VCC (V)
4.5 to
5.5
VIL — — 0.8 — 0.8 V 4.5 to
5.5
Output voltage
VOH
VOL
Off-state output
current
I OZ
Input current
Iin
Quiescent current ICC
4.4 — — 4.4 — V
4.18 — — 4.13 —
— — 0.1 — 0.1 V
— — 0.26 — 0.33
— — ±0.5 — ±5.0 µA
4.5
4.5
4.5
4.5
5.5
— — ±0.1 —
— — 4.0 —
±1.0 µA
40 µA
5.5
5.5
Vin = VIH or VIL IOH = –20 µA
IOH = –6 mA
Vin = VIH or VIL IOL = 20 µA
IOL = 6 mA
Vin = VIH or VIL,
Vout = VCC or GND
Vin = VCC or GND
Vin = VCC or GND, Iout = 0 µA
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Item
Symbol
Propagation delay tPLH
time
t PHL
Output enable
t ZL
time
t ZH
Output disable
t LZ
time
t HZ
Output rise/fall
time
t TLH
t THL
Input capacitance Cin
Ta = 25°C
Ta = –40 to
+85°C
Min Typ Max Min Max
— 11 22 — 28
— 13 22 — 28
— 17 30 — 38
— 14 30 — 38
— 20 30 — 38
— 22 30 — 38
— 4 12 — 15
— 5 10 — 10
Unit
ns
ns
ns
ns
pF
Test Conditions
VCC (V)
4.5
4.5
4.5
4.5
4.5
4.5
4.5
—
3
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Номер в каталоге | Описание | Производители |
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